Process for preparing foamed gypsum and constructional elements

Details Process for preparing foamed gypsum and constructional elements Process for preparing foamed gypsum and constructional elements

1978-05-18

1979-05-08

Poer, James

Compositions: coating or plastic

Coating or plastic compositions

Proteinaceous material containing

C04B 1114

Patent

active

041534700

ABSTRACT:
Foamed gypsum is produced by mixing gypsum with water in the presence of additives serving for liquefying the gypsum and for adjusting the starting period, and by adding thereto a mixture of isocyanate compounds and polyurethane preadducts.
After a starting period of about five minutes a foaming process occurs, which is completed after about 20 minutes and furnishes a foamed gypsum after setting. The foamed gypsum has a density from 0.45 to 0.8 g/cc, whereas unfoamed gypsum has a density of 1.66 g/cc.
The process may be performed in special molds, so that after setting specially formed elements are obtained, e.g. sandwich elements.

REFERENCES:
patent: 3878278 (1975-04-01), Miller

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